Automatic door-closer



(NoModelJ J. B. STONER.

AUTOMATIC DOOR CLOSER.

No. 478,246. v Patented July 5, 1892..

f WITNESSE $94R %ENTOR A c MAAM WWW ATTORNEYQY 1 ans co., worm-mum,WASHINGTON o c UNITED STATES PATENT OFFICE.

JOHN B. STONER, OF NEl/V YORK, N. Y., ASSIGNOR-TO LEONIE FORDHAM, OF

LONG BRANCH, NEW JERSEY.

AUTOMATIC DOOR-CLOSER.

SPECIFICATION forming part of Letters Patent No. 478,246, dated July '5,1892.

Application filed January 21, 1892. Serial No. 418,866. No model.)

To all whom, it may concern.-

Be it known that 1, JOHN B. SToNER, of the city of New York, county ofNew York, and State of New York, have invented a certain new and usefulImprovement in Automatic Door-Closers, of which the following is aspecification.

This invention relates more particularly to automatic closers forsliding doors and it consists in the construction and novel arrangementof parts, as hereinafter set forth.

In the accompanying drawings, Figure 1 is an elevation of a door with aportion broken away, showing an automatic closer embodying myimprovement. Fig. 2 is a rear edge view thereof. Fig. 3 is a sideelevation of a door, showing a closer of modified construction. Fig. 4is an enlarged view of a camarm employed.

Referring by letter to the drawings, A designates a door adapted toslide into the opening A in the wall or partition. The door is supportedby rollers a, which run on the rail a in the usual manner.

The closer consists of an arm or rod B, pivoted to the door A at oneend, as at b, and havinga roller 1) at its free end adjacent the rearedge of the door, a cam-arm B, and a spring B In sliding doors inresidences and similar places it is desirable that the door-closer behidden from View. I have therefore in Fig. 1 shown the door hollow inits upper portion, and the part B of the closer is arranged within thishollow, as shown in Figs. 1 and 2.

In Figs. 1 and 2 the closing-spring B is shown as attached at one end tothe arm B near its free end and the other end of the spring is attachedto the rear edge of the door, as here shown, by means of a bracket bfastened by screws or otherwise to the door. The cam-arm B is secured atits rear end to an upright a at the rear-of the opening A, and has aninclined or cam-shaped lower surface 0, upon which the roller 5 of thearm B bears. The incline of the surface 0 is upward from the rear orfastened end of the arm B. Obviously when the door A is pushed into theopening A the free end of the pivoted arm B will be forced downward bythe cam-surface c, and thus expand the spring 13 The door,

if desired, may be secured in an open posi tion by any preferable means.Upon releasing the door the retraction of the spring B will draw theroller 1) upward on the camsurface 0 and cause the door to close.

As a means for giving the door a quicker or greater impetus at itsstart, I provide the cam-surface cat its rear end with an increasedpitch 0, and as the door is liable to rebound and fail to latch at theend of its initial forward movement I provide the forward end of thecam-surface c with an increased pitch 0 In Fig. 3 I have shown thecloser designed more particularly for heavy doors, such as barn-doors.In this example I employ two arms D D, pivoted at one end to the surfaceof the door, and two cam-arms D D The cam-surface of the arm D is on theupper edge thereof and the cam-surface of the arm D' is on the loweredge thereof. The rollers 01 of the respective arms D D move upon thecam-surface of the arms D D and a spring cl extends from the arm D tothe arm D, adjacent the rollers d. In this construction when the door isopened the arms D D will be caused to diverge at their roller ends andexpand the spring. Upon releasing the door, the spring will retract anddraw the arms D D toward each other along the cam-surface of the arms DD ,'thus closing the door. In both examples of my improvement theclosing of the door is caused by the retraction of a spring carried bythe door and operating a movable part against an inclined fixed part.

Having described my invention, what I claim is- 1. The combination, witha sliding door, of an arm pivoted at one end to said door, a roller atthe opposite end of the arm, a spring secured at one end to the door andat the 1 other end to the pivoted arm, and a fixed cam- .arm, againstwhich the roller bears, substantially as specified.

2. The combination, with a sliding door, of 5 a closer consisting of thepivoted arm having a roller and a spring carried by the door and thefixed arm having the inclined surface provided with an increased pitchat its rear end, substantially as specified.

3. The combination, with a sliding door, of a closer consisting of thepivoted arm having r a roller at its free end and a spring carried bythe door, and the fixed arm having the inclined 01' cam surface providedwith an increased pitch at its forward end, substantially as specified.

4. The combination, with a sliding door, of a closer consisting of a,pivoted arm having a roller at its free end and a spring carried by saiddoor,and a fixed arm having an inclined 01' cam surface provided with anincreased 10 pitch at each end, substantially as specified. Signed atNew York city, in the county of New York and State of New York, this 1stday of January, A. D. 1892.

JOHN B. STONER.

W'itnesscs:

LOUIS L. ROLLAND, ABRAM S. HIRSOH.

